macpro laptop stolen

I advertised my MacBook pro for sale on gumtree, this guy sms me that he is interested.so he sends me the prrof of payment with a copy of his id, a courier company came to pick it up. on the sunday the courier phones me back telling me that I muts pay R600 so he can bring the laptop back to me for the client never paid me. I pay the R600 and he tells me he will be delivering it in an hour. 2 hours later I phone him,he tells me to pay in another 300 cause his car broke down and he needs to pay the mechanic. I told him that this is not my problem. now he refuses to deliver my laptop until I pay the mechanic. the company's name is videlela couriers,drivers no. 0735018429, I googled it,there is no such company,can someone please help me